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How can I convert List to int[] in Java? [duplicate]（16个答案）
（19个答案）
昨天关门了。
我想用list.toArray（）把列表转换成数组，这样代码就简单了。但是In遇到了如下的"编译错误"。有人能解释一下原因吗？谢谢!

public int[] intersection(int[] nums1, int[] nums2) {
    Set<Integer> set = new HashSet<>();
    List<Integer> temp = new ArrayList<>();
    for(int num1:nums1) set.add(num1);
    for(int num2:nums2) {
        if(!set.contains(num2)) continue;
        temp.add(num2);
        set.remove(num2);
    }
    int[] re = temp.toArray(new int[temp.size()]);
    return re;
}

Line 11: error: no suitable method found for toArray(int[])
        int[] re = temp.toArray(new int[temp.size()]);
                       ^
    method Collection.<T#1>toArray(IntFunction<T#1[]>) is not applicable
      (cannot infer type-variable(s) T#1
        (argument mismatch; int[] cannot be converted to IntFunction<T#1[]>))
    method List.<T#2>toArray(T#2[]) is not applicable
      (inference variable T#2 has incompatible bounds
        equality constraints: int
        lower bounds: Object)
  where T#1,T#2 are type-variables:
    T#1 extends Object declared in method <T#1>toArray(IntFunction<T#1[]>)
    T#2 extends Object declared in method <T#2>toArray(T#2[])

希望获取转换后的数组，但失败。